/*
 * OREKIT-X
 * Copyright 2002-2008 CS Communication & Systemes
 * 
 * Parts of this software package have been licensed to CS
 * Communication & Systemes (CS) under one or more contributor license
 * agreements.  See the NOTICE file distributed with this work for
 * additional information.
 *  
 * This is an experimental copy of OREKIT from www.orekit.org.
 * Please use the original OREKIT from orekit.org for normal work
 * unrelated to this research project.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you
 * may not use this file except in compliance with the License.  You
 * may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied.  See the License for the specific language governing
 * permissions and limitations under the License.
 */
package ore.time;

/** 
 * Terrestrial Time as defined by IAU(1991) recommendation IV.
 * 
 * Coordinate time at the surface of the Earth. IT is the
 * successor of Ephemeris Time TE.
 * 
 * By convention, TT = TAI + 32.184 s.
 * 
 * This class is intended to be accessed via the {@link TimeScalesFactory} class.
 * 
 * @author Luc Maisonobe
 * @see AbsoluteDate
 */
public final class TTScale 
    extends Object
    implements TimeScale
{
    public final static TimeScale Instance = new TTScale();


    private TTScale() {
        super();
    }


    public double offsetFromTAI(AbsoluteDate date) {
        return 32.184;
    }
    public double offsetToTAI(DateComponents date, TimeComponents time) {
        return -32.184;
    }
    public String getName() {
        return "TT";
    }
    public String toString() {
        return this.getName();
    }
}
